If i read your question right, you should open IPTC template, and if you click the "Load" button, it will open a window where your IPTC data is stalled, mine ones are saved in documents. They are saved as a XMP file. Copy them on to a usb stick and transfer to new computer.
You could probably search your computer for any XMP files to.
This is how it works on my computer, i running windows 10.